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HBase is simply a non-relational database that runs on HDFS which is essentially a filesystem abstraction layer on top of Hadoop which is map-reduce framework. Apache HBase provides Bigtable-like capabilities on top of Hadoop and HDFS. So the breakdown is like this, HDFS is a distributed file system that is well suited for the storage of large files. ...


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Cassandra definitely is more suitable for storage of metadata only, when you have big payloads, it's performance isn't very good. Similar stuff was for HBase when I did use it several years ago. For storage of binary data itself, I maybe would go with something S3-compatible.


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